How to determine whether View state is being restored

Issue

In my custom view i have some field that I want to restore or create new instance if it will not be restored. Surprisingly I didn't find answer for that

Examle class

class MyView extends View {
    private Calendar calendar;
    public MyView(Context context) {
        super(context);
        if(!restoring())
            calendar = Calendar.getInstance();
    }

    @Nullable
    @Override
    protected Parcelable onSaveInstanceState() {
        Bundle b = new Bundle();
        b.putParcelable("state", super.onSaveInstanceState());
        b.putLong("calendar", calendar.getTimeInMillis());
        return b;
    }

    @Override
    protected void onRestoreInstanceState(Parcelable state) {
        if (state instanceof Bundle) {
            Bundle b = ((Bundle) state);
            super.onRestoreInstanceState(b.getParcelable("state"));
            calendar = Calendar.getInstance();
            calendar.setTimeInMillis(b.getLong("calendar"));
        }
    }
}

Is there some check inside custom view that I can make to determine whether view will be restored?

In Activity there is Bundle savedInstanceState passed to onCreate()

I thought of making static boolean but it is not way to go.

Solution

Is there some check inside custom view that I can make to determine whether view will be restored?

Within View class there does not exist such an API.

The only seam that is given you is onRestoreInstanceState(Parcelable), which will "never be called with null state". Thus, if you end up being in onRestoreInstanceState(), then you can assume, that the view is being restored. Otherwise it is not.

Answered By - azizbekian